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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a2c4287a00ac9348cdfd11ba1d0cc3f98d19107ff01e2e212f0e1ee28fdc1d' 
  AND token = 'eto7lhleKhTkg6B2UrrBABWUxuiW/3GIIph45wLIcsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}